IF
21 - 4
13 = 6
23 = 12
34 = 24
THEN
25 = ?

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

amber has allowed scientists to study dna that has been preserved over millions of years.

straight or amphibians are homeothermic to thermal